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Summary of Significant Accounting Policies - Summary of Inventories (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Accounting Policies [Abstract]    
Raw materials $ 706.8 $ 668.3
Work-in-process 90.2 45.6
Finished goods 150.6 139.8
Inventories $ 947.6 $ 853.7